State True or False with one line explanation Expanding opcode instruction formats are commonly employed in RISC. (Reduced Instruction Set Computers) machines.Correct answer is 'TRUE'. Can you explain this answer? - EduRev Computer Science Engineering (CSE) Question

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State True or False with one line explanation Expanding opcode instruction formats are commonly employed in RISC. (Reduced Instruction Set Computers) machines.

Correct answer is 'TRUE'. Can you explain this answer?

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State True or False with one line explanation Expanding opcode instruc...

The answer is TRUE.
RISC systems use fixed length instruction to simplify pipeline.
eg: MIPS, PowerPC: Instructions are 4 bytes long.
CISC systems use Variable-length instructions.
eg: Intel 80x86: Instructions vary from 1 to 17 bytes long.
Now the challenge is: How to fit multiple sets of instruction types into same (limited) number of bits (Fixed size instruction)?
Here comes Expanding opcode into the picture.
RISC systems commonly uses Expanding opcode technique to have fixed size instructions.

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Abbreviate CISC and RISC.

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An instruction pipeline has five stages, namely, instruction fetch (IF), instruction decode and register fetch (ID/RF), instruction execution (EX), memory access (MEM), and register writeback (WB) with stage latencies 1 ns, 2.2 ns, 2 ns, 1 ns, and 0.75 ns, respectively (ns stands for nanoseconds). To gain in terms of frequency, the designers have decided to split theID/RF stage into three stages (ID, RF1, RF2) each of latency 2.2/3 ns. Also, the EX stage is split into two stages (EX1, EX2) each of latency 1 ns. The new design has a total of eight pipeline stages. A program has 20% branch instructions which execute in the EX stage and produce the next instruction pointer at the end of the EX stage in the old design and at the end of the EX2 stage in the new design. The IF stage stalls after fetching a branch instruction until the next instruction pointer is computed. All instructions other than the branch instruction have an average CPI of one in both the designs. The execution times of this program on the old and the new design are P and Q nanoseconds, respectively. The value of P/Q is __________. Correct answer is '1.54'. Can you explain this answer?

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The instruction pipeline of a RISC processor has the following stages: Instruction Fetch (IF), Instruction Decode (ID), Operand Fetch (OF), Perform Operation (PO) and Writeback (WB). The IF, ID, OF and WB stages take 1 clock cycle each for every instruction. Consider a sequence of 100 instructions. In the PO stage, 40 instructions take 3 clock cycles each, 35 instructions take 2 clock cycles each, and the remaining 25 instructions take 1 clock cycle each. Assume that there are no data hazards and no control hazards.The number of clock cycles required for completion of execution of the sequence of instructions is ______.

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Using an expanding opcode encoding for instructions, is it possible to encode all of the following in an instruction formatshown in the below figure. Justify your answer.14 double address instructions127 single address instructions60 no address (zero address) instructions Correct answer is 'So all encoding are possible'. Can you explain this answer?

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what are the instruction codes Related: Instruction Formats - Computer Organization and Architecture

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State True or False with one line explanation Expanding opcode instruction formats are commonly employed in RISC. (Reduced Instruction Set Computers) machines.Correct answer is 'TRUE'. Can you explain this answer?

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